<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>环保工程季度数据报表</title>
</head>
<body>
<table width="550" border="6"align="center">
    <caption>环保工程季度数据报表</caption>
    <thead style="background: #0af">
    <tr>
    <tr>季度</tr>
    <th>销量</th>
    </tr>
    </thead>
    <tbody style="background: #6cc">
    <tr>
        <td>一季度</td>
        <td>12</td>
    </tr>
    <tr>
        <td>二季度</td>
        <td>11</td>
    </tr>
    <tr>
        <td>三季度</td>
        <td>13</td>
    </tr>
    <tr>
        <td>一季度</td>
        <td>12</td>
    </tr>
    </tbody>
    <tfoot tbody style="background: #ff6">
    <tr>
        <td>季度平均工程数量</td>
        <td>12</td>
    </tr>
    <tr>
        <td>总计</td>
        <td>48</td>
    </tr>
    </tfoot>
</table>
</body>
</html>